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Notonuphar antarctica, an extinct water lily (Nymphaeales) from the Eocene of Antarctica
Swedish Museum of Natural History, Department of Paleobiology.ORCID iD: 0000-0003-2936-2761
Instituto de Investigaciones en Biodiversidad y Ambiente INIBIOMA (CONICET-UNCO), San Carlos de Bariloche, Argentina.
División Paleontología de Vertebrados, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata – CONICET, Buenos Aires, Argentina.
Swedish Museum of Natural History, Department of Paleobiology.ORCID iD: 0000-0003-2268-5824
2017 (English)In: Plant Systematics and Evolution, ISSN 0378-2697, E-ISSN 1615-6110, Vol. 303, no 7, 969-980 p.Article in journal (Refereed) Published
Abstract [en]

A new genus and species, Notonuphar antarctica, is described from the Eocene of Seymour (Marambio) Island, the Antarctic Peninsula and assigned to the Nymphaeales based on well-preserved seeds. This is the first record of a water lily from Antarctica and the first record of a Gondwanan plant with close link to the genus Nuphar (Nymphaeaceae), which is restricted today to the Northern Hemisphere. Critical features for systematic placement of Notonuphar are the presence of a germination cap with closely spaced hilar scar and micropyle, anatropous, bitegmic and exotestal seed organization, exotesta composed of one cell layer of high sclerenchymatic palisade-shape cells, mesotesta of smaller, low parenchymatic cells, a few cell layers deep, and a thin tegmen. The seeds of Notonuphar are particularly similar to seeds of extant and fossil Nuphar in the straight, unfolded anticlinal wall of the exotestal cells and the presence of a narrow zone of exotestal tissue between hilum and micropyle. Other seed features including the very tall exotestal cells and strongly thickened cell walls of exotesta also link Notonuphar to Brasenia and related fossil taxa (Cabombaceae). This character mosaic observed in Notonuphar corroborates the transitional position of Nuphar between Cabombaceae and Nymphaeaceae. Notonuphar is the only member of Nymphaeales recorded from Antarctica and so far the only fossil seeds of Nymphaeales known from the Southern Hemisphere. The discovery of this extinct Gondwanan taxon with features suggesting close relationship with extant Northern Hemisphere genus Nuphar is a further evidence for the relictual nature of the extant group.

Place, publisher, year, edition, pages
Vienna, 2017. Vol. 303, no 7, 969-980 p.
Keyword [en]
Antarctic Peninsula, basal angiosperms, Fossil seeds, Gondwana, Nuphar, Paleogene
National Category
Earth and Related Environmental Sciences
Research subject
Ecosystems and species history
Identifiers
URN: urn:nbn:se:nrm:diva-2475DOI: 10.1007/s00606-017-1422-yOAI: oai:DiVA.org:nrm-2475DiVA: diva2:1149240
Funder
Swedish Research Council, 2014-5228
Note

Other funding from:

Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET Grant PIP 0462 to MAR.), the Argentine National Agency for Promotion of Science and Technology (ANPCyT Grant PICTO-2010–0093 to MAR) and the Paul Scherrer Institute https://www.psi.ch/useroffice/useroffice (projects 20130185, 20141047, 2016140)

Available from: 2017-10-13 Created: 2017-10-13 Last updated: 2017-12-04Bibliographically approved

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Publisher's full texthttps://link.springer.com/article/10.1007/s00606-017-1422-y#citeas

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